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Bucharest, Romania

Rapa M.,Science ICPAO SA Medias | Ghioca P.N.,INCDCP ICECHIM | Grosu E.,Science ICPAO SA Medias | Iancu L.,INCDCP ICECHIM | And 4 more authors.
Journal of Optoelectronics and Advanced Materials | Year: 2013

Polypropylene (PP) is a thermoplastic polymer used as packaging for alcoholic and nonalcoholic beverages bottles, detergent and cosmetics, bags, transparent packaging for food and non-food industrial products, pipes, fittings and other applications. In this paper, wastes of PP resulted from textile cones were modified with poly (styrene-isoprene-styrene) (SIS). Recycled PP/SIS composites containing 0, 5, 10, 15, 20, 25 and 30 weight % of SIS were performed by melt alloying technique. By varying of SIS content can be tailored composites able to meet the service requirements when PP is used as recycled materials for specific end use applications. It is found that new developed composites show a good elasticity and notched impact IZOD compared with unmodified PP wastes and are suitable for industry field, e.g. automotive parts. Source


Rapa M.,Science ICPAO S.A. | Matei E.,Polytechnic University of Bucharest | Ghioca P.N.,Polymer Dep. | Cincu C.,Science ICAA SA | Niculescu M.,Orthopaedics and Traumatology
Journal of Adhesion Science and Technology | Year: 2016

Poly(vinyl chloride) (PVC) is one of the most used materials with applications in the medical field. One approach to replace the phthalate plasticizers from PVC is to use other thermoplastic polymers having the same characteristics and performances as plasticized PVC. Modification of random polypropylene (PPR) by melt mixing technique with different thermoplastic elastomers: (poly[styrene-b-(ethylene-co-butylene)-b-styrene] (SEBS) and poly(styrene-b-butadiene-b-styrene) (SBS) at various content ratios was investigation. The obtained blends were characterized by the determination of the elastomer content influence on density, crystallinity index, melting temperature, degree of crystallinity, crystallite size, and phase morphology. The results showed that the melting temperature of PPR/SBS blends was significantly lower than that of PPR/SEBS blends. Addition of SEBS or SBS to PPR had different effect on crystallite sizes and morphology of blends, and the same effect on decrease the degree of crystallinity of blends. The spectra of the blends by Fourier transform infrared spectroscopy indicated the presence of specific bands both for propylene, styrene, and ethylene-butadiene. Optical images revealed the appearance of regular and smaller SEBS domains than those of SBS in PPR matrix, making a high compatibility of SEBS with PPR matrix. © 2016 Taylor & Francis Source


Rapa M.,Science ICPAO S.A. | Grosu E.,Science ICPAO S.A. | Ghioca P.N.,INCDCP ICECHIM | Iancu L.,INCDCP ICECHIM | And 4 more authors.
Materiale Plastice | Year: 2016

This investigation concerns the preparation of binary PPR/SEBS and PPR/SBS blends by melt mixing procedure with the goal of studying the effect of thermoplastic elastomers on performance of polypropylene random copolymer (PPR) in the extrusion and injection molding processes. Effect of poly[styrene-b-(ethylene-cobutylene)-b-styrene] (SEBS) and poly(styrene-b-butadiene-b-styrene) (SBS) respectively on the mechanical and thermal properties of PPR have been investigated. The melt processability, melt flow index (MFI), tensile properties, VICAT softening temperature (VST), heat deflection temperature (HDT), Shore hardness and IZOD measurements highlighted that SEBS is more efficient than SBS. Source


Ghioca P.,Romanian National Institute for Research and Development in Chemistry and Petrochemistry | Spurcaciu B.,Romanian National Institute for Research and Development in Chemistry and Petrochemistry | Iancu L.,Romanian National Institute for Research and Development in Chemistry and Petrochemistry | Grigorescu R.,Romanian National Institute for Research and Development in Chemistry and Petrochemistry | And 7 more authors.
Materiale Plastice | Year: 2015

This study aims to reintroduce the economic circuit of recovered uncontaminated with organic impurities polypropylene sorts, the melt alloying of polyolefin with styrene-isoprene block copolymers. Source

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